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I have restarted the phone several times.I just tried restarting the network settings and have the same problem. If I place an outbound call, I'll see 4G replace LTE at the top of the screen very briefly. When the call is in progress, 4G disappears and nothing is shown in its place next to the word "AT&T". The error message I receive says: "Cellular data connections are not available during this call." Under General > Cellular, Cellular Data is on, Enable LTE is on.

Are you in a 3G area? I would assume that you are if you are in an area covered by LTE. Because of the way that the iPhone 5 is designed, if you attempt to use data and voice at the same time, the data should fall back to the 3G network, and you should be able to do both at the same time. The data will not go over LTE while you are on a call because voice and data are on the same chip.

It sounds like your calls are falling down to the 2G network, which doesn't allow similtaneous voice and data. I'm not familiar with your available settings options, but do you have 3G enabled on your phone?

In iOS6, the only option is to enable/disable LTE. 4G (HSPA+), 3G, and EDGE are on by default, unless you turn off all cellular data.

They do claim the on the AT&T network, the phone will fall back to 3G when in an LTE area, but how does that actually work? If you initiate or receive a voice call, does that automatically drop everything back to 3G, both voice and data, even if your aren't using daa at the time? Or if you are on a voice call and then try to use data while in an LTE area, does that then drop everything back to 3G? If it's not working, the transition may not be working right.

I contacted chat support and didn't accomplish much. They are going to open a ticket to see if there's an unreported outage or other issue. If this is a larger problem specific to St. Lous, I would have expected more people to complain about it. Getting this phone going is proving to be a very time intensive process.

No your mixing the technologies. Those are two seprate and differnt senarios. The LTE (ATT GSM Version) will always fall back to 3G for data if there is a call. No matter if the data was initated before or during the call.

The other statement was for netowrks that don't support it simultanious (ie CDMA), the data is dropped completely for the call if you were in a data session or will not be available if your in a call.

I don't know how that solution actually is a viable one since it does not work. like I said the phone does not go down to 3G when on a call. It stays on LTE and gives an error that data can not be used during a phone concall. This needs to be checked and fixed.

I don't know how that solution actually is a viable one since it does not work. like I said the phone does not go down to 3G when on a call. It stays on LTE and gives an error that data can not be used during a phone concall. This needs to be checked and fixed.

I just got off my second AT&T support chat of the weekend. A ticket was opened after the first session; the tech wanted to find out if there was a larger issue going on. It's obvious there isn't because more people would be talking about it. My second session tonight ended with no progress. The tech tried to tell me LTE isn't in my area even though my phone shows the LTE network. I gave him LTE and 4G speed tests to prove him wrong. I shouldn't need to do that. After that, he told me to wait until my ticket was resolved. This is getting stupid. I'm going to the Apple Store tomorrow, but I can't imagine there's much they can do, unless they want to replace my phone (which wouldn't really address the AT&T problem).

I'm not saying your not having issues. I'm just trying to think of ways to break out troubleshooting to determine if it would be a device issue, and account issue or possible network issue in your area.

The part that should be happening and it's not is when your phone goes from LTE to 4G, it should stay there on 4G so it can use data. But for some reason it not. The 4G is dissapearing after a second the then there is nothing after the AT&T.